Improvement in bench-planes



' G. M. THOMPSON.

Bench-Planes.

2 Sheets--'Sheet1.

Patented July 21,1874.

THE RApnn: mpanmmyuaswMm-nk PLACE, Nib

UNITED STATES PATENT OFFICE.

IMPROVEMENT IN BENCH-PLANES.

Specification forming part of Letters Patent No. 153,399, dated July 21,1874; application filed June 13. 1874.

To all whom it may concern:

Be it known that I, GEORGE M. THOMPSON, of Boston, in the county ofSuffolk and State of Massachusetts, have invented a new and valuableImprovement in Bench-Planes; and I do hereby declare that the followingis a full, clear, and exact description of the construction andoperation of the same, reference being had to the annexed drawingsmaking a part of this specification, and to the letters and figures ofreference marked thereon.

Figure l of the drawing is a representation of a longitudinal verticalsection of my plane. Fig. 2 is a top plan view, and Fig. 3 is a bot tomplan view. Fig. 4 is a transverse section, and Figs. 5, (i, and 7 aredetail views. Fig. 8 is an under-side view of the chip E.

This invention has relation to that class of bench-planes havingmetallic stocks 5 and it consists, principally, in a bed-frame andmovable carriage for the plane-iron, which carriage is adjustable bymeans of a rack and segment lever and a thumb-screw, and affords a broadand firm bearing for the plane-iron. It further consists in combining,with the planeiron and its adjustable bed, a jointed chip, or wedge,which is provided with a setscrew, by means of which the upper and lowerends of the said chip can be made to bear with considerable force uponthe plane-iron, and rigidly hold it in place. My invention consists,further, in constructing V-shaped lugs on the the plane-iron carriage,which lugs are adapted to enter notches made in the edges of theplane-iron, and thereby prevent the same from slipping longitudinallywhen adjusted on its carriage, as will be hereinafter more fullyexplained.

The following is a description of my improvements In the annexeddrawings, A designates a sole-plate, and B B the side flanges or cheeksthereof, which, with the plate, constitute a metal plane-stock,which iscast entire. 0 and C designate the handles of the stock, which are ofthe usual well-known form,and are secured on top of the sole-plate inany suitable manner. The bottom and top surfaces of the sole plate areconstructed with numerous grooves, a, arranged alternately in regularrows of short sections, which greatly reduce the frictional surface,while at the same time they lighten the stock very much. The grooves aon top of the sole-plate are disposed between the grooves a, and alsolighten the stock without materially reducing its strength or stiffness.The said grooves run in a direction with the length of the stock, andthey are preferably made quite short, so that they will not interferewith the dressing of the edge of a very narrow piece of stuff. Ddesignates a frame, which is rigidly secured upon the sole-plate A, inrear of the throat, by means of a clamp, c. This frame D is constructedwith a bearin g, b yfijr the lower portion of the plane-iron G the upperportion of which iron is supporteilupon an inclined carriage or slidingbed, I) This carriage b is guided in the frame D by means of lips 19 pand hooking-lugs L l, (shown in Fig. 6,) and it is constructed withV-shaped lugs j j, which enter notches t' i made in the edges of theplane-iron G, and thus prevent endwise displacement of the plane-iron onits carriage. On the bottom side of the carriage I) a rack, r, isformed, the teeth of which engage with a toothed segment, which isformed on the short arm of a lever, F, which has its fulcrum at f onstandard h, rising from the base of the frame D. The longer arm of leverF is forked, and embraces an annular groove in an adjusting-nut, g,which nut is applied on a screw, 9, rising perpendicularly from arearextension of the base of frame D. By adjusting the nut g, thecarriage b can be moved up and down in the frame D, and the plane-ironcan be nicely adjusted according to the thickness of the shavingrequired. E designates what is denominated the chip, which is of wedgeform, and composed of two pieces hinged together at e, and pro videdwith a set-screw, c. When the plane-iron G is in place on the carriage band bearing 1), the chip is inserted between it and four hooked lugs, dd d cl, after which the parts are rigidly secured in place by means ofthe screw 0, which bears 011 the plane-iron, and,by centrally bowing upthe joint 6, forces the ends of the chip hard down on the planeiron, asindicated in Fig. 1.

I am aware that similar devices have heretofore been used, as shown inthe patent of Leonard Bailey, dated August 6, 1867, N o.

the plane-iron G upon its carriage 1), arranged as described.

3. The carriage b, provided with lugs j, combined with a plane-ironhaving notches i 'i in the edges to correspond therewith, substantiallyas in the manner shown and described. In testimony that I claim theabove I have hereunto subscribed my name in the presence substantiallyas of two witnesses.

Witnesses: GEO. M. THOMPSON.

GEORGE E. UPHAM, FRANK J. 1\[ASI.

